Text and Data Mining valid from 2018-04-10
Received: 22 January 2018
Revised: 1 March 2018
Accepted: 12 March 2018
First Online: 10 April 2018
Compliance with ethical guidelines
: I. Martinovic, S. Lindemann, M. Irqsusi, J. Mirat, A. Vcev, T. Wittlinger, M. Noutsias declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.